Spark-plug



F. HACHIVIANN.

SPARK PLUG.

APPLICATION FILED SEPT.22. 1919.

Paented May 25, 1920,

UNITE STATES PATENT oFFlcE.

FREDERICK" HACHMANN, OF ST. LOUIS, MISSOURI, ASSIGNOR 0F ONE-HALF TO DAVID M. HUTCHINSON, 0F FERGUSON, MISSOURI, ONE-SIXTEENTI-I TO MONTE G. PRICE,

OF EFFING-I-IAM, ILLINOIS, ONE-SIXTEENTH TO CHAUNCEY R.

WATSON AND ONE- SIXTEENTI-I TO PHILIP E. MOODY, BOTH OF DETROIT, MICHIGAN.

Specification of Letters Patent.

Patented May 25, 1920.

Application led' September 22, 1919. Serial No. 325,488.

useful Improvements in Spark-Plugs, of

which the following is a specification, containing a full, clear, and exact description., references being had to accompanying drawings, forming a part thereof.

This invention relates to improvements in spark plugs and has for its primary object a spark plug provided with a channel shaped ring, the purpose of which is to remove accumulated carbon on the outside of the porcelain insulator and also on the inside of the casing.

A. further object is to provide a spark plug with a cleaning member, so that the accumulation of carbon. will be prevented on both the porcelain insulator and the casing.

In the drawings Figure 1 is an elevation of my invention with parts broken away and in section.

F ig. 2 an enlarged cross sectional view of the cleaning member made use of, and

Fig. 3 an enlarged view of the counter weight.

In the construction'of my device, I make useY of acasing l which is referably of theN tween the porcelain insulator 5 and the,

casing 6, I employ the gaskets 9 and the binding nut 10; these `being of the ordinary construction are not described in detail.

The chamber 7 is provided with vertical walls 117 so that the walls 8 of the insulator will be spaced equally therefrom. In other words, the walls 8 and 11 will be parallel to cach other.

The lower portion of the casing 4 is provided with an extension 12; this extension being recessed so as to form a seat for the ring 13. The inner surface 14 of this ring projects beyond the surface of the chamber 7, so as to form the shoulder 15. Surrounding the porcelain insulator 5, is placed the cleaning member 16; this member being rlng shaped and channel shaped in cross sect10n, (see F ig. 2), the walls 17 acting as Scrapers against the wall 11 of the casing, and the wall 8 scraping the wallor vertical portion 8 .of the insulator 5.

This cleaner is provided with. a circumferential depression 19 into which the ring 20 fits. This ring may be split as shown in Flg. 3, or be made solid and acts as a counter weight to bring the cleaner 16 downward by gravity.

The cleaning member 16 is lformed of aluminum as it has a higher specific heat than iron Yor brass," and will consequently burn upany carbon which may settle on it, and also will consume articles of carbon which maylodge in the casing or on the porcelain insulator in its passage upward and downward; this operation of the ring being controlled or caused by the explosion and exhaust inthe engine cylinder or expansion chamber.

The operation of my device is as follows:

The plug having been secured in the explosion chamber of an internal combustion engine, and the engine started, the force of the explosion will cause thevcleaning member to be driven upward in the chamber 7; the ring 2O acting as a counter Weight t0- gether with the suction caused by the eX- haust vwill draw the ring downwardly, its lowest limit being regulatec'l by the ring 13, which' ring will prevent the cleaning member 19 from dropping out of the chamber 7. In fact the ring 13 is not inserted in the spark plug until the cleaning member 16 and the counter weight 20`have been placed in position, so it will be readily seen that the device can be assembled as cheap as any plug of the present construction.

Another thing to be noted is that by the use of my plug there is virtually no change for the accumulation of carbon, which being a well known conductor of electricity is the cause of most spark plug trouble this trouble being caused by carbon accumulating on the porcelain insulator, and the casing surrounding the insulator, and forming a solid bridge of carbon between the two electrodes, so that the electric current will flow through infr electrode toV they other, and thus causing missing of the electrodes.

Having fully described my invention what l claim is: Y

l. ln a spark plug comprising a casing,

`a porcelain insulator secured within said casing, said insulator and casing having vertical parallel Walls forming a chamber, an aluminum cleaning ring provided with downwardly projecting flanges interposed between the insulator and the casing, said flanges acting as a scraper for the Walls of the insulator and casing.

2. In a spark plug comprising a casing, a porcelain insulator secured within said casing, said insulator and casing having vertical parallel walls forming a chamber, an aluminum cleaning ring provided with downwardly projecting flanges interposed between the insulator andthe casing, said flanges acting as a scraper"l for the walls of the insulator and casing, and a ring inserted in the lower end of the casing for retaining the cleaning ring.

3. In a spark plug comprising a casing, a porcelain insulator secu-red within said casg, said insulator and casing having ver- Lea-Leia.

'tical parallel walls forming a chamber, an

flanges acting as a scraper for the walls ofthe insulator and casing, and a second ring located above' the cleaningring, said second ring adapted to act as a counter weight.

4. ln a spark plug comprising a casing, a porcelain insulator secured within said casing, said insulator and casing having vertical parallel walls forming a chamber, an aluminum cleaning ring provided with downwardly projecting flanges interposed between the insulator and the casing, said flanges acting as a scraper for the walls of the' insulator and casing, a ring inserted in the lower end of the casing for retaining the cleaning ring, and a second ring located above the cleaning ring, said second ring adapted to act asl a counter weight.

ln testimony whereof I have signed my name to this specification, in presence of two subscribing witnesses.

FREDERICK HACHMANN. Witnesses:

JEAN GOLDBERG,

EDWARD E. LONGAN. 

